| LiCoO2中锂离子固相扩散系数随循环次数的变化 |
| Variation of Solid Diffusion Coefficient for Lithium Ions in LiCoO2 with Charge-discharge Cycles |
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| 摘要: |
| 关键词: 容量间歇滴定技术(CITT) LiCoO2 固相扩散系数 锂离子电池 |
| 基金项目: |
| Abstract: The solid diffusion coefficient of lithium-ion in LiCoO2 cathode material has been investigated by the capacity intermittent titration technique (CITT) at different voltages and at different charge/discharge cycles. By SEM, XRD and FTIR techniques, the structure of LiCoO2 was studied before and after charge-discharge cycles, and the relationship between solid diffusion coefficient and crystal structure was further discussed. CITT results show that the value of Li+ solid diffusion coefficient of LiCoO2 is about 10-12 cm2·s-1. During the whole charge-discharge cycles, the Li+ solid diffusion coefficient decreased within the voltage of 4.0～4.3 V, which is attributed to the change of the structure of LiCoO2. |
| Keywords: capacity intermittent titration technique (CITT) lithium cobalt oxide solid diffusion coefficient lithium-ion battery |
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| 金乐,唐新村,潘春跃,蒋呈奎.LiCoO2中锂离子固相扩散系数随循环次数的变化[J].无机化学学报,2007,23(7):1238-1241. |
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